Greenspan says Fed didn't cause the housing bubble

Former U.S. Federal Reserve Chairman Alan Greenspan said lower rates on long-term, fixed-rate mortgages and not the Federal Reserve's policies are to blame for the U.S. housing bubble.

Calling his explanation of the causes far more credible than blaming 'easy money' policies, Greenspan wrote that it was indeed lower interest rates that spawned the speculative euphoria. However, the interest rate that mattered was not the federal-funds rate, adding that U.S. mortgage rates' linkage to short-term rates had been close for decades.

The Federal Reserve became aware of the disconnect between monetary policy and mortgage rates when the latter failed to respond as expected to the Fed tightening in mid-2004, said Greenspan, who was the Federal Reserve Chairman from 1987 to 2006.

Given the decoupling of monetary policy from long-term mortgage rates, accelerating the path of monetary tightening that the Fed pursued in 2004-2005 could not have prevented the housing bubble, he said.

The solutions for the financial-market failures revealed by the crisis are higher capital requirements and a wider prosecution of fraud -- not increased micromanagement by government entities, Greenspan wrote.

Any new regulations should improve the ability of financial institutions to effectively direct a nation's savings into the most productive capital investments, he said.

Our challenge in the months ahead will be to install a regulatory regime that will ensure responsible risk management on the part of financial institutions, while encouraging them to continue taking the risks necessary and inherent in any successful market economy, he said.